Laplacian edge detection algorithm is widely used in the removal of cosmic ray noise in the CCD astronomical images,but it has higher computation complexity of single CPU.To solve this problem,this paper proposes a parallel Laplacian edge detection algorithm with Graphic Processor Unit(GPU) based on Compute Unified Device Architecture(CUDA) by analyzing the parallelism of Laplacian edge detection.The main algorithm running on the main CPU is responsible for split the astronomical image into some subgraphs.T...